Chem

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Thermochemistry:

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This is the area of chemistry concerned with the quantities of heat evolved or absorbed during chemical reactions.

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Calorimetry

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This is the measurement of the amount of heat evolved or absorbed in a chemical reaction, change of state or formation of a solution.

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Law of conservation of Energy:

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Law of Conservation of energy is the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes.

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joule

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Joule: This is the S1 unit of work or energy, equal to the work done by a force of one newton when its point of application moves one meter in the direction of action of the force, equivalent to one 3600th of a watt-hour.

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Calorie:

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Calorie: This is a unit of heat used to indicate the amount of energy that foods will produce in the human body.

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Energy:

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Energy: Energy is power derived from the utilization of physical or chemical resources, esp. to provide light and heat or to work machines.

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Heat:

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Heat: Heat is the form of energy that flows between two samples of matter due to their difference in temperature, usually denoted by the variable Q.

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Temperature:

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Temperature: Temperature is the degree or intensity of heat present in a substance or object, esp. as expressed according to a comparative scale and shown by a thermometer or perceived by touch.

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- exothermic :

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- exothermic : Exothermic is a reaction or a process accompanied by the release of heat.

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- endothermic:

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Endothermic is a reaction or a process accompanied by or requiring the absorption of heat.

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Phase graph:

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A phase graph or phase diagram is a diagram representing the limits of stability of the various phases in a chemical system at equilibrium, with respect to variable such as composition and temperature.

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Heat of Fusion:

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Heat of Fusion is heat absorbed by a unit mass of a solid at its melting point in order to convert the solid into a liquid at the same temperature. “ the heat of Fusion is equal to the heat of Solidification.”

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Heat of Vaporization:

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This is the amount of heat required to convert a unit mass of a liquid at its boiling point into vapor without an increase in temperature. The amount of heat required to convert a liquid into a gas at constant temperature and pressure.

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Evaporate:

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Evaporate: To change a liquid into a gas

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Condense:

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Condense: This is to change or cause to change from a gas or vapor to a liquid.

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Triple point:

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Triple point: This is the temperature and pressure at which the solid, liquid and vapor phase of a pure substance can coexist in equilibrium.

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Vapor pressure:

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Vapor pressure: The pressure of a vapor in contact with its liquid or solid form.

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Heat/Cooling Curve:

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Heat/Cooling Curve: This is a graphical plot of temperatures plotted on the Y- Axis versus the X-Axis. Heating curves increase to the right and cooling curves decrease to the right. In both cases a plateau is reached when the substance undergoes a change in phase.

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Enthalpy :

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Enthalpy : A thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.

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Heat Capacity: .

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Heat Capacity: The number of heat units needed to raise the temperature of a body by one degree

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Heat of Solution:

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The heat evolved or absorbed when one mole of a substance is dissolved in a large volume of a solvent.

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Hess’s Law:

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Hess’s Law: A statement in chemistry: the heat change in a chemical reaction is the same regardless of the number of stages in which the reaction is effected.